Strange front-focusing problem with Sigma 35/1.4
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badlydrawnboy
Registered: Mar 19, 2006
Total Posts: 1856
Country: United States

Not necessarily. The MA was done with the center focus point. Most of the AF problems I've had involved real-world shooting using non-center AF points. The Canon rep I spoke with said it's in theory possible that the outer AF points aren't functioning properly.



mttran
Registered: Nov 03, 2005
Total Posts: 6868
Country: United States

badlydrawnboy wrote:
Not necessarily. The MA was done with the center focus point. Most of the AF problems I've had involved real-world shooting using non-center AF points. The Canon rep I spoke with said it's in theory possible that the outer AF points aren't functioning properly.


Fast lenses stopping down effects has screwed up your outter AF calculation as discussed here: http://www.fredmiranda.com/forum/topic/1179122/5#11247175



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